<template>
  <view class="goods-item">
    <!-- 左侧盒子 -->
    <view class="goods-item-left">
      <radio :checked="goods.goods_state" color="#c00000" v-if="showRadio" @click="radioClickHandler"></radio>
      <image :src="goods.goods_small_logo || defaultPic" class="goods-pic"></image>
    </view>
    <!-- 右侧盒子 -->
    <view class="goods-item-right">
      <!-- 商品名称-->
      <view class="goods-name">{{goods.goods_name}}</view>
      <!-- 商品价格 -->
      <view class="goods-info-box">
        <view class="goods-price">¥{{goods.goods_price | tofixed}}</view>
        <uni-number-box 
          :min="1" 
          :value="goods.goods_count" 
          v-if="showNum"
          @change="numChangeHandler"
        ></uni-number-box>
      </view>
    </view>
  </view>
</template>

<script>
  export default {
    props: {
      goods:{
        type: Object,
        default:{}
      },
      showRadio: {//在页面上绑定为属性
        type: Boolean,
        default: false
      },
      showNum: {//在页面上绑定为属性，在外部需要时绑定并设置为true，相反为false
        type: Boolean,
        default: false
      }
    },
    name:"my-goods",
    
    data() {
      return {
        //默认图片
        defaultPic: 'https://img3.doubanio.com/f/movie/8dd0c794499fe925ae2ae89ee30cd225750457b4/pics/movie/celebrity-default-medium.png'
      };
    },
    
    filters:{
      tofixed(num){
        return Number(num).toFixed(2)
      }
    },
    methods: {
      //这是 radio 组件的 点击事件处理函数
      radioClickHandler(){
        //radio-change 是外部 cart.vue中自定义事件 的类型
        this.$emit('radio-change', { //通过$emit()触发外部定义的函数，以下参数就是外部事件处理函数中的e
          goods_id: this.goods_id, //代表所点的是哪个item
          goods_state: !this.goods.goods_state  //注：取反 -- 点击时即获得当时状态的相反值
        }) 
      },
      
      //监听到了 NumberBox 组件数量变化的事件
      numChangeHandler(val){//val就是点击+，-时输出的值
        // console.log(val) 
        this.$emit('num-change',{//num-change是外部绑定的事件名
          goods_id: this.goods_id,
          goods_count: val+0  //或+val 都可以转成数字
        })
      }
    }
  }
</script>

<style lang="scss">
  .goods-item{
    width: 750rpx;/*宽度占满整个宽*/
    box-sizing: border-box; //盒子模型
    display: flex;
    padding: 10px 5px;
    border-bottom: 1px solid #dddddd;
    
    .goods-item-left{
      margin-right: 6px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      
      .goods-pic{
        width: 100px;
        height: 100px;
        border-radius: 6px;
        display: block;//防止图片下面有空白间隙
      }
    }
    .goods-item-right{
      display: flex;
      flex: 1; /*表示占满这个右侧区域*/
      flex-direction: column;
      justify-content: space-between;
      
      .goods-name{
        font-size: 13px;
      }
      .goods-info-box{
        display: flex;
        justify-content: space-between;
        align-items: center;
        
        .goods-price{
          color: #c00000;
          font-size: 16px;
        }
      }
    }
  }
</style>

